代码选择器在运行时使用inheritage [英] Code selector using inheritage during runtime

问题描述

有没有办法在容器中插入抽象类？

是否有基类访问派生类的方法？使用虚拟函数。

此示例代码是否有正确工作方式，并且控制台能够 bark ？

有一种方法可以使<

Is there a way to insert an abstract class inside a container? No.
Is there a way for a base class to access derived classes? Using virtual functions.
Is there a way for this example code to work properly and the console to bark?
Is there a way for the vector container to keep the instances and not references/pointers?

将指针存储在 std：

Storing pointers inside the std::vector will only be safe if I use reference counters to the instances, which is my last resort. Do I miss something?

class CAnimal
{
public:
    virtual void soundsLike()
    {
        cout<<"Base function\n";
    }   
};

class CDog: public CAnimal
{
public:
    void soundsLike()
    {
        cout<<"Woof\n";
    }
};

class CZoo
{
public:
    std::vector<CAnimal> animalList;

    void addDog()
    {
        animalList.push_back(CDog());
    }

};

控制台输出基本功能消息：

Console outputs the base function message:

int main(int argc, char* argv[])
{
    CZoo nationalPark;
    nationalPark.addDog();
    nationalPark.animalList.front().soundsLike(); //Calls the base function.
    return 0;
}

推荐答案

=http://en.cppreference.com/w/cpp/memory/unique_ptr =nofollow> std :: unique_ptr

You could use std::unique_ptr

std::vector< std::unique_ptr<CAnimal> > zoo;
zoo.push_back(new CDog());
zoo[0]->soundsLike();

是不是？ unique_ptr会处理你的破坏。

Is it bad? unique_ptr will handle the destruction for you.

我不认为你可以使用引用。另外我不认为你可以使它树皮目前。只有woof。

I don't think you can use references. Also I don't think you can make it "bark" currently. Only "woof".

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